[Maxima] calculating with bfloats (was: stuff not in 5.13 branch)
Harald.Geyer at gmx.at
Sat Aug 4 16:25:26 CDT 2007
> One thing I (and I think other users) would very much like to see is a
> global key which transparently turns on and off arbitrary
> precision. I realize that this may require redoing some intrinsic
> functions, so it may take time to do. Are any of the current lisps
> set up to do this?
This is not a matter of the lisp implementation. AFAIK bfloats are
implemented entirely within the maxima source.
If you don't use floats (use rationals instead) you get exact
arithmetic by default.
I think the main change would be to make the parser read floats as
bfloats. I don't really see the point of that.
> I have tried to work on individual variables and functions (at this
> point involving algebraic functions no worse than square roots) by
> declaring all variables and functions to be bfloat, but for some
> reason it doesn't work. Certain of the operations still come back as
> float. Maybe the square root is the problem. I have been using
> cmucl. Is that a potential problem?
Do you have example sessions, that show this behaviour? Probably there
are some bugs. I'd fix the bugs rather than inventing a new global
The only problem I'm aware of in this context is the numer flag.
But you shouldn't need to use that, if you work with bfloats from
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